Photosensitive composition

Abstract

A photosensitive composition comprising: a sensitizing dye represented by the following formula (1): in which A represents an optionally substituted aromatic ring or an optionally substituted hetero ring; X represents an oxygen atoms a sulfur atom, or —N(R 6 )—; and R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 each independently represents a hydrogen atom or a monovalent non-metal atomic group; an activator compound being capable of causing a chemical change due to a mutual action with light absorption of the sensitizing dye represented by the formula (1) so as to generate at least one of a radical, an acid and a base; and a compound being capable of reacting with at least one of a radical and an acid so that physical or chemical characteristics thereof change irreversibly.

1. A photosensitive composition comprising:
 a sensitizing dye represented by the following formula (1): 
 
       
         
           
           
               
               
           
         
       
       in which A represents an optionally substituted aromatic ring or an optionally substituted hetero ring; X represents an oxygen atom; and R 1 , R 2 , R 3 , R 4 , R 5 , and R 6  each independently represents a hydrogen atom or a monovalent non-metal atomic group;
 an activator compound being capable of causing a chemical change due to a mutual action with light absorption of the sensitizing dye represented by the formula (1) so as to generate at least one of a radical, an acid and a base; and 
 a compound being capable of reacting with at least one of a radical and an acid so that physical or chemical characteristics thereof change irreversibly. 
 
     
     
       2. The photosensitive composition according to  claim 1 , wherein the activator compound is a titanocene compound. 
     
     
       3. The photosensitive composition according to  claim 1 , wherein the compound being capable of reacting with at least one of a radical and an acid is an addition polymerizable compound having an ethylenically unsaturated double bond. 
     
     
       4. The photosensitive composition according to  claim 3 , wherein the addition polymerizable compound has at least one terminal ethylenically unsaturated double bond. 
     
     
       5. The photosensitive composition according to  claim 3 , wherein the addition polymerizable compound has at least two terminal ethylenically unsaturated double bonds. 
     
     
       6. The photosensitive composition according to  claim 1 , further comprising a cosensitizer. 
     
     
       7. The photosensitive composition according to  claim 1 , further comprising a thermal polymerization inhibitor. 
     
     
       8. The photosensitive composition according to  claim 1 , wherein A in the formula (1) represents an optionally substituted N,N-diphenylaminobenzene group or an optionally substituted carbazole group. 
     
     
       9. A lithographic printing plate precursor comprising a support and photosensitive layer containing the photosensitive composition according to  claim 1 . 
     
     
       10. The lithographic printing plate precursor according to  claim 9 , wherein the photosensitive layer further contains a binder polymer. 
     
     
       11. The lithographic printing plate precursor according to  claim 9 , further comprising a protective layer containing a water-soluble polymer so that the support, the photosensitive layer and the protective layer are in this order.